Out of Memory triggered by certain sourcemaps

[ersimont]

Trying to simply load() @js-sdsl/ordered-map in its versions 4.2-4.4 results in

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

This happens because that library includes index.js in its list of sources for index.js.map, which leads to an infinite loop in Node.load().

I don't know enough about sourcemaps to say if this setup is legal/valid. I'll open a ticket in that library too if you say it's wrong/incorrect, and pass along any other info you think will help them. Either way, it took several hours to track this down. This ticket is a request to either:

• Detect this situation, handle it, and succeed
• Detect this situation, abort, and print a meaningful error message